Improvement in safety-valves



' without the stop-oooh.

lit.'

HENRY F. SNYDEB, 0F WILLIMSPORT, PENNSYLVANIA.

Y Leners raient no. 110,082, (not December '13, 1870.- Y

The Schedule referred to in these Latter-a Patent and making part ox the came.

To all whom 'it may concern.

Be it known that I, HENRY F. SNYDER, of Williamsport, in the county oi' Lycoming, in the State of Pennsylvania, have invented certain new and useful Improvements in Safety-Valves, adapted more particularly for use on oil-tank cnrs; and I do hereby declare the following is a full and exact description thereof. v

I will rst describe what I consider the best means ol carrying out my invention, and will afterward des-- ignote the points which I beleveto be new.

The accompanying drawing forms a part of this specification.

Figure-1 is a central vertical section through the ralrc, and its housingT and connection with a portion of an oil-tank car, to wh'ch it is'fitted.

Figure 2 is a horizontal section.

The above show sonic ot' the important features Figure 3 shows tlle same with a stop-cock, which renders this the nfiost perfect form ot' the construct-ion.-

'Sirnilnr letters of reference' indicate corresponding parts in all the figures.

A is ai stout casing or cast-ing, of' bra-ss or .other suitable material, threaded on the exterior and around its waist, and iinished conically below, to match a corresponding portion in the massive casting or lixtnre B,.which is bolted upon the tank. M,fas will be understood.

The casing .11 is milde hexagonal about this threaded belt, to allow its being conveniently inserted into B, and removed therefron'i.

The interior carries a conical valve, D, having wings D', which guide it in an. ohrious manner as it rises to allow the escape oi' vapor, and again sinks upon the corresponding seat.

It is pressed do\.'nward hy a coiled spring, C, which coils around the stem d, and acts against n steadiment, E, as an abutment.

This steadirnent 1s supported in n. central position` by arms El, from a ring, E2, which fits within the contracted upper portion ofthe casing A,`a1id is held up by a flange, e. l 'l The upper portion `of the casing A isl threaded on 'its exterior, as represented, and'adapted to receive a screw-cap, I, providedwith vents or miertnresz', which nia-y be directed downward or npwarthas may he preieri-ed, or hot-l1 together may be employed, as represented. There may, if preferred, he but a single uperturein the upper side, and this may be provided with a small tube, as indicated by J, which shall serve as' a burner.y It may be made in the style of a gasburner; and may be shielded bya chimney of glass or other material to protect'it. from wind.

By such devices, any vapor escaping through the safcty-va1ve may' be burned` as fast as itv escapes, and

the car may benioved rapidly or exposed to violent winds or other 'disturbing influences without. extinguishing the flame. The device may also be accompanied by a small lamp, supplied-with petroleum or the like, and fed 'by a wick so as to constantly man- .l

volatile hydrocarbons areexposcd in the open air, V- the Yapormay be allowed to blow away unconsumed.

And when vapor is found to escape in a. close building, the jets once ignited-will remain so, and will burn up all the vapor without such additional preoanl tions.

I provide4 an internal flange, I', within the screwcap I, which, pressing down firmly upon the'ange e and the adjacent portion of' the ring El, holds in position a wire-gauze strainer, marked G, which has the effect, long ago published bySir Humphrey Davy and othersa of preventing the passage of haine.

.In ense the escaping vapor burns, being ignited either intentionally or accidentally, an'd theliame extends inward into the interior of the screwcap I, this strainer G prevents the dame 'from' extending below it. f lho vapor may-bornes it rises slowly throngli the wire-cloth, and under the arrangement shown may be fed with air through some of the holes i, and the heated products* of combustion may escape freely through other holes, the choice oi' holes being controlled by the direction of the wind or other causes. In case there are suiiicicnt holes bot-h above and helow, the air will ordinarily enter through the lower ones, and the .products ol' combustion escape throueh the upper hole or holes.

It is not usually important to maintain a high degree of tension on the spring C. It is important simplyjo hold it in its seat with sniieient firmness to preventits rising by any accident-al jarring, or hy the gravity either of itself or of the contents of t-he tank in onse oi' an inclination, or of apartial or complete overturning of the tank in case of accident.

The entire apparatus may be made small. My ex periments have beenmade with a-valre of the exact ysize here represented.'

Fig. 3 represents the casing A as made longer, and

having 'a stop-cock, K', mounted therein. By turning this cock the entire passa-ge is stopped under all cir einnsmnces. Ib is particularly important; in case of lernilment and a partial or complete or erturning of ihe tank, :uid may be used with advantage in stundinf: where any escape of vapor would be uhjectionnble.

l. claim- 1. The combination of' the easing A -und its contained safety-vedra; and guiding undone/rating means wih i'nestrainer'G, adapted tu prevent any possible :uff-v z ff' rianne frmn the exterior to pass the valve, zu; spurnied.

2. 'j he perforated cap I ,'in combination with the casing :ind its conta-ined Snfetywnlve, and guiding und operaring means, as specified.

3. The combination of the screw-cap I Ji, flange I', metallic strainer G, vulve 1) Dd,`steadiment E El E2, and casing A, constructed as represented, :1nd adapted to serve relatirely t-n the casing B and tank A, :is amd for the purposes herein set forth.

4. The stop-cock K, arranged relatively to the szifetywalve D, spring O, and strainer G, :is and for the purposes herein specitied.

Intestimony whereof, I have hereunto set myname in presence of t-wo subscribing witnesses.

H.' F. SNYDER. Vitnesscs:

T. C. ROGERS, H. D. Hmslsn. 

